the research was published in the journal, "science translational medicine." the paper reported the tests of just six newborns in neonatal units, but the implications could be widespread. roughly 20% of infant deaths in the u.s. are caused by inherited genetic conditions, according to the study. doctor stephen kingsmore led the research team at children's mercy hospitals in kansas city. he's the director for the center for pediatric genomic medicine there. dr. kingsmore, welcome, and thank you for being with us. first of all,-- >> thank you very much. >> warner: how big a breakthrough is this? >> this is a big breakthrough. we've been working toward this goal for a coup of years now. there has been a big gap between the knowledge that we have of genetic diseases, about 35% of them, and the ability for doctors to identify which of these was a problem in any given child with an illness. >> warner: and up until now, how much have you been able to diagnose the d.n.a. abnormalities? how quickly? i mean, i said it can take weeks and weeks, but what's the process tha